Jack had been considered a top-10 pick, but concerns about a knee injury that kept him out most of 2015 caused him to slip. The Jaguars traded up two spots to grab him with the 36th overall selection. Jack had 88 tackles in 2014 and was named Pac-12 freshman of the year in 2013 on offense and defense. He scored seven touchdowns and had 75 tackles that season.